<template>
  <el-container class="home_container">
    <!-- 头部区域 -->
    <el-header>
      <div class="left_header">
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout" class="btn-out">退出</el-button>
    </el-header>
    <!-- 页面主体区 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside width="isCollapse ? '64px':'200px'">
        <div class="toggle_button" @click="toogleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.id + ' '"
            v-for="item in menuList"
            :key="item.id"
          >
            <!-- 一级菜单模板区 -->
            <template slot="title">
              <i :class="iconsObj[item.id]"></i>
              <span class="text">{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/' + subItem.path"
              v-for="(subItem, subIndex) in item.children"
              :key="subIndex"
              @click="saveNavState('/' + subItem.path)"
            >
              <i class="el-icon-menu"></i>
              <span>{{ subItem.authName }}</span>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 内容主体区 -->
      <el-main> 
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: "Home",
  created() {
    this.getMenuList();
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  data() {
    return {
      menuList: [],
      iconsObj: {
        125: "el-icon-user-solid",
        103: "el-icon-s-cooperation",
        101: "el-icon-s-goods",
        102: "el-icon-s-order",
        145: "el-icon-s-platform",
      },
      isCollapse: false,
      activePath:''
    };
  },
  methods: {
    // 退出home界面
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    // 获取左侧列表菜单数据
    async getMenuList() {
      const { data: res } = await this.$http.get("menus");
      // console.log(res);
      if (res.meta.status !== 200) return this.$message.error();
      this.menuList = res.data;
    },
    // 点击按钮，设置菜单展开与折叠
    toogleCollapse() {
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath);
      this.activePath = activePath
    }
  },
};
</script>

<style scoped>
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
  font-size: 20px;
}
.left_header {
  display: flex;
  align-items: center;
}
.left_header span {
  margin-left: 15px;
}
.el-aside {
  background-color: #333744;
}
.el-main {
  background-color: #eaedf1;
}
.home_container {
  height: 100%;
}
.text {
  margin-left: 6px;
}
.el-menu {
  border-right: none;
}
.toggle_button {
  background-color: #4a5064;
  font-size: 10px;
  text-align: center;
  line-height: 25px;
  color: #fff;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>